1 /* Plugin control for the GNU linker.
2 Copyright 2010 Free Software Foundation, Inc.
4 This file is part of the GNU Binutils.
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 3 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
19 MA 02110-1301, USA. */
22 #include "libiberty.h"
33 #include "plugin-api.h"
35 #if !defined (HAVE_DLFCN_H) && defined (HAVE_WINDOWS_H)
39 /* The suffix to append to the name of the real (claimed) object file
40 when generating a dummy BFD to hold the IR symbols sent from the
42 #define IRONLY_SUFFIX ".ironly\004"
44 /* This is sizeof an array of chars, not sizeof a const char *. We
45 also have to avoid inadvertently counting the trailing NUL. */
46 #define IRONLY_SUFFIX_LEN (sizeof (IRONLY_SUFFIX) - 1)
48 /* Stores a single argument passed to a plugin. */
49 typedef struct plugin_arg
51 struct plugin_arg
*next
;
55 /* Holds all details of a single plugin. */
58 /* Next on the list of plugins, or NULL at end of chain. */
60 /* The argument string given to --plugin. */
62 /* The shared library handle returned by dlopen. */
64 /* The list of argument string given to --plugin-opt. */
66 /* Number of args in the list, for convenience. */
68 /* The plugin's event handlers. */
69 ld_plugin_claim_file_handler claim_file_handler
;
70 ld_plugin_all_symbols_read_handler all_symbols_read_handler
;
71 ld_plugin_cleanup_handler cleanup_handler
;
72 /* TRUE if the cleanup handlers have been called. */
73 bfd_boolean cleanup_done
;
76 /* The master list of all plugins. */
77 static plugin_t
*plugins_list
= NULL
;
79 /* We keep a tail pointer for easy linking on the end. */
80 static plugin_t
**plugins_tail_chain_ptr
= &plugins_list
;
82 /* The last plugin added to the list, for receiving args. */
83 static plugin_t
*last_plugin
= NULL
;
85 /* The tail of the arg chain of the last plugin added to the list. */
86 static plugin_arg_t
**last_plugin_args_tail_chain_ptr
= NULL
;
88 /* The plugin which is currently having a callback executed. */
89 static plugin_t
*called_plugin
= NULL
;
91 /* Last plugin to cause an error, if any. */
92 static const char *error_plugin
= NULL
;
94 /* A hash table that records symbols referenced by non-IR files. Used
95 at get_symbols time to determine whether any prevailing defs from
96 IR files are referenced only from other IR files, so tthat we can
97 we can distinguish the LDPR_PREVAILING_DEF and LDPR_PREVAILING_DEF_IRONLY
98 cases when establishing symbol resolutions. */
99 static struct bfd_hash_table
*non_ironly_hash
= NULL
;
101 /* Set at all symbols read time, to avoid recursively offering the plugin
102 its own newly-added input files and libs to claim. */
103 static bfd_boolean no_more_claiming
= FALSE
;
105 /* If the --allow-multiple-definition command-line option is active, we
106 have to disable it so that BFD always calls our hook, and simulate the
107 effect (when not resolving IR vs. real symbols) ourselves by ensuring
108 TRUE is returned from the hook. */
109 static bfd_boolean plugin_cached_allow_multiple_defs
= FALSE
;
111 /* List of tags to set in the constant leading part of the tv array. */
112 static const enum ld_plugin_tag tv_header_tags
[] =
119 LDPT_REGISTER_CLAIM_FILE_HOOK
,
120 LDPT_REGISTER_ALL_SYMBOLS_READ_HOOK
,
121 LDPT_REGISTER_CLEANUP_HOOK
,
124 LDPT_RELEASE_INPUT_FILE
,
127 LDPT_ADD_INPUT_LIBRARY
,
128 LDPT_SET_EXTRA_LIBRARY_PATH
131 /* How many entries in the constant leading part of the tv array. */
132 static const size_t tv_header_size
= ARRAY_SIZE (tv_header_tags
);
134 #if !defined (HAVE_DLFCN_H) && defined (HAVE_WINDOWS_H)
136 #define RTLD_NOW 0 /* Dummy value. */
139 dlopen (const char *file
, int mode ATTRIBUTE_UNUSED
)
141 return LoadLibrary (file
);
145 dlsym (void *handle
, const char *name
)
147 return GetProcAddress (handle
, name
);
151 dlclose (void *handle
)
153 FreeLibrary (handle
);
157 #endif /* !defined (HAVE_DLFCN_H) && defined (HAVE_WINDOWS_H) */
159 /* Helper function for exiting with error status. */
161 set_plugin_error (const char *plugin
)
163 error_plugin
= plugin
;
167 /* Test if an error occurred. */
169 plugin_error_p (void)
171 return error_plugin
!= NULL
;
174 /* Return name of plugin which caused an error if any. */
176 plugin_error_plugin (void)
178 return error_plugin
? error_plugin
: _("<no plugin>");
181 /* Handle -plugin arg: find and load plugin, or return error. */
183 plugin_opt_plugin (const char *plugin
)
187 newplug
= xmalloc (sizeof *newplug
);
188 memset (newplug
, 0, sizeof *newplug
);
189 newplug
->name
= plugin
;
190 newplug
->dlhandle
= dlopen (plugin
, RTLD_NOW
);
191 if (!newplug
->dlhandle
)
192 return set_plugin_error (plugin
);
194 /* Chain on end, so when we run list it is in command-line order. */
195 *plugins_tail_chain_ptr
= newplug
;
196 plugins_tail_chain_ptr
= &newplug
->next
;
198 /* Record it as current plugin for receiving args. */
199 last_plugin
= newplug
;
200 last_plugin_args_tail_chain_ptr
= &newplug
->args
;
204 /* Accumulate option arguments for last-loaded plugin, or return
207 plugin_opt_plugin_arg (const char *arg
)
209 plugin_arg_t
*newarg
;
212 return set_plugin_error (_("<no plugin>"));
214 newarg
= xmalloc (sizeof *newarg
);
218 /* Chain on end to preserve command-line order. */
219 *last_plugin_args_tail_chain_ptr
= newarg
;
220 last_plugin_args_tail_chain_ptr
= &newarg
->next
;
221 last_plugin
->n_args
++;
225 /* Create a dummy BFD. */
227 plugin_get_ir_dummy_bfd (const char *name
, bfd
*srctemplate
)
232 bfd_use_reserved_id
= 1;
233 abfd
= bfd_create (concat (name
, IRONLY_SUFFIX
, (const char *)NULL
),
235 bfd_set_arch_info (abfd
, bfd_get_arch_info (srctemplate
));
236 bfd_make_writable (abfd
);
237 /* Create a minimal set of sections to own the symbols. */
238 sec
= bfd_make_section_old_way (abfd
, ".text");
239 bfd_set_section_flags (abfd
, sec
,
240 (SEC_CODE
| SEC_HAS_CONTENTS
| SEC_READONLY
241 | SEC_ALLOC
| SEC_LOAD
| SEC_KEEP
));
242 sec
->output_section
= sec
;
243 sec
->output_offset
= 0;
247 /* Check if the BFD passed in is an IR dummy object file. */
249 is_ir_dummy_bfd (const bfd
*abfd
)
255 namlen
= strlen (abfd
->filename
);
256 if (namlen
< IRONLY_SUFFIX_LEN
)
258 return !strcmp (abfd
->filename
+ namlen
- IRONLY_SUFFIX_LEN
, IRONLY_SUFFIX
);
261 /* Helpers to convert between BFD and GOLD symbol formats. */
262 static enum ld_plugin_status
263 asymbol_from_plugin_symbol (bfd
*abfd
, asymbol
*asym
,
264 const struct ld_plugin_symbol
*ldsym
)
266 flagword flags
= BSF_NO_FLAGS
;
267 struct bfd_section
*section
;
269 asym
->the_bfd
= abfd
;
270 asym
->name
= ldsym
->version
271 ? concat (ldsym
->name
, "@", ldsym
->version
, NULL
)
281 section
= bfd_get_section_by_name (abfd
, ".text");
288 section
= bfd_und_section_ptr
;
293 section
= bfd_com_section_ptr
;
294 asym
->value
= ldsym
->size
;
301 asym
->section
= section
;
303 /* Visibility only applies on ELF targets. */
304 if (bfd_get_flavour (abfd
) == bfd_target_elf_flavour
)
306 elf_symbol_type
*elfsym
= elf_symbol_from (abfd
, asym
);
308 einfo (_("%P%F: %s: non-ELF symbol in ELF BFD!"), asym
->name
);
309 elfsym
->internal_elf_sym
.st_other
&= ~3;
310 elfsym
->internal_elf_sym
.st_other
|= ldsym
->visibility
;
316 /* Register a claim-file handler. */
317 static enum ld_plugin_status
318 register_claim_file (ld_plugin_claim_file_handler handler
)
320 ASSERT (called_plugin
);
321 called_plugin
->claim_file_handler
= handler
;
325 /* Register an all-symbols-read handler. */
326 static enum ld_plugin_status
327 register_all_symbols_read (ld_plugin_all_symbols_read_handler handler
)
329 ASSERT (called_plugin
);
330 called_plugin
->all_symbols_read_handler
= handler
;
334 /* Register a cleanup handler. */
335 static enum ld_plugin_status
336 register_cleanup (ld_plugin_cleanup_handler handler
)
338 ASSERT (called_plugin
);
339 called_plugin
->cleanup_handler
= handler
;
343 /* Add symbols from a plugin-claimed input file. */
344 static enum ld_plugin_status
345 add_symbols (void *handle
, int nsyms
, const struct ld_plugin_symbol
*syms
)
350 ASSERT (called_plugin
);
351 symptrs
= xmalloc (nsyms
* sizeof *symptrs
);
352 for (n
= 0; n
< nsyms
; n
++)
354 enum ld_plugin_status rv
;
355 asymbol
*bfdsym
= bfd_make_empty_symbol (abfd
);
357 rv
= asymbol_from_plugin_symbol (abfd
, bfdsym
, syms
+ n
);
361 bfd_set_symtab (abfd
, symptrs
, nsyms
);
365 /* Get the input file information with an open (possibly re-opened)
367 static enum ld_plugin_status
368 get_input_file (const void *handle
, struct ld_plugin_input_file
*file
)
370 ASSERT (called_plugin
);
376 /* Release the input file. */
377 static enum ld_plugin_status
378 release_input_file (const void *handle
)
380 ASSERT (called_plugin
);
385 /* Get the symbol resolution info for a plugin-claimed input file. */
386 static enum ld_plugin_status
387 get_symbols (const void *handle
, int nsyms
, struct ld_plugin_symbol
*syms
)
389 const bfd
*abfd
= handle
;
391 ASSERT (called_plugin
);
392 for (n
= 0; n
< nsyms
; n
++)
394 struct bfd_link_hash_entry
*blhe
;
397 blhe
= bfd_link_hash_lookup (link_info
.hash
, syms
[n
].name
,
401 syms
[n
].resolution
= LDPR_UNKNOWN
;
405 /* Determine resolution from blhe type and symbol's original type. */
406 if (blhe
->type
== bfd_link_hash_undefined
407 || blhe
->type
== bfd_link_hash_undefweak
)
409 syms
[n
].resolution
= LDPR_UNDEF
;
412 if (blhe
->type
!= bfd_link_hash_defined
413 && blhe
->type
!= bfd_link_hash_defweak
414 && blhe
->type
!= bfd_link_hash_common
)
416 /* We should not have a new, indirect or warning symbol here. */
417 einfo ("%P%F: %s: plugin symbol table corrupt (sym type %d)",
418 called_plugin
->name
, blhe
->type
);
421 /* We need to know if the sym is referenced from non-IR files. */
422 ironly
= !bfd_hash_lookup (non_ironly_hash
, syms
[n
].name
, FALSE
, FALSE
);
424 /* If it was originally undefined or common, then it has been
425 resolved; determine how. */
426 if (syms
[n
].def
== LDPK_UNDEF
|| syms
[n
].def
== LDPK_WEAKUNDEF
427 || syms
[n
].def
== LDPK_COMMON
)
429 asection
*owner_sec
= (blhe
->type
== bfd_link_hash_common
)
430 ? blhe
->u
.c
.p
->section
431 : blhe
->u
.def
.section
;
432 if (owner_sec
->owner
== link_info
.output_bfd
)
433 syms
[n
].resolution
= LDPR_RESOLVED_EXEC
;
434 else if (owner_sec
->owner
== abfd
)
435 syms
[n
].resolution
= (ironly
)
436 ? LDPR_PREVAILING_DEF_IRONLY
437 : LDPR_PREVAILING_DEF
;
438 else if (is_ir_dummy_bfd (owner_sec
->owner
))
439 syms
[n
].resolution
= LDPR_RESOLVED_IR
;
440 else if (owner_sec
->owner
->flags
& DYNAMIC
)
441 syms
[n
].resolution
= LDPR_RESOLVED_DYN
;
443 syms
[n
].resolution
= LDPR_RESOLVED_EXEC
;
447 /* Was originally def, or weakdef. Does it prevail? If the
448 owner is the original dummy bfd that supplied it, then this
449 is the definition that has prevailed. */
450 if (blhe
->u
.def
.section
->owner
== link_info
.output_bfd
)
451 syms
[n
].resolution
= LDPR_PREEMPTED_REG
;
452 else if (blhe
->u
.def
.section
->owner
== abfd
)
454 syms
[n
].resolution
= (ironly
)
455 ? LDPR_PREVAILING_DEF_IRONLY
456 : LDPR_PREVAILING_DEF
;
460 /* Was originally def, weakdef, or common, but has been pre-empted. */
461 syms
[n
].resolution
= is_ir_dummy_bfd (blhe
->u
.def
.section
->owner
)
463 : LDPR_PREEMPTED_REG
;
468 /* Add a new (real) input file generated by a plugin. */
469 static enum ld_plugin_status
470 add_input_file (const char *pathname
)
472 ASSERT (called_plugin
);
473 if (!lang_add_input_file (xstrdup (pathname
), lang_input_file_is_file_enum
,
479 /* Add a new (real) library required by a plugin. */
480 static enum ld_plugin_status
481 add_input_library (const char *pathname
)
483 ASSERT (called_plugin
);
484 if (!lang_add_input_file (xstrdup (pathname
), lang_input_file_is_l_enum
,
490 /* Set the extra library path to be used by libraries added via
491 add_input_library. */
492 static enum ld_plugin_status
493 set_extra_library_path (const char *path
)
495 ASSERT (called_plugin
);
496 ldfile_add_library_path (xstrdup (path
), FALSE
);
500 /* Issue a diagnostic message from a plugin. */
501 static enum ld_plugin_status
502 message (int level
, const char *format
, ...)
505 va_start (args
, format
);
510 vfinfo (stdout
, format
, args
, FALSE
);
513 vfinfo (stdout
, format
, args
, TRUE
);
519 char *newfmt
= ACONCAT ((level
== LDPL_FATAL
? "%F" : "%X",
521 vfinfo (stderr
, newfmt
, args
, TRUE
);
530 /* Helper to size leading part of tv array and set it up. */
532 set_tv_header (struct ld_plugin_tv
*tv
)
537 static const unsigned int major
= (unsigned)(BFD_VERSION
/ 100000000UL);
538 static const unsigned int minor
= (unsigned)(BFD_VERSION
/ 1000000UL) % 100;
541 return tv_header_size
;
543 for (i
= 0; i
< tv_header_size
; i
++)
545 tv
[i
].tv_tag
= tv_header_tags
[i
];
546 #define TVU(x) tv[i].tv_u.tv_ ## x
547 switch (tv
[i
].tv_tag
)
550 TVU(message
) = message
;
552 case LDPT_API_VERSION
:
553 TVU(val
) = LD_PLUGIN_API_VERSION
;
555 case LDPT_GNU_LD_VERSION
:
556 TVU(val
) = major
* 100 + minor
;
558 case LDPT_LINKER_OUTPUT
:
559 TVU(val
) = link_info
.relocatable
? LDPO_REL
560 : (link_info
.shared
? LDPO_DYN
: LDPO_EXEC
);
562 case LDPT_OUTPUT_NAME
:
563 TVU(string
) = output_filename
;
565 case LDPT_REGISTER_CLAIM_FILE_HOOK
:
566 TVU(register_claim_file
) = register_claim_file
;
568 case LDPT_REGISTER_ALL_SYMBOLS_READ_HOOK
:
569 TVU(register_all_symbols_read
) = register_all_symbols_read
;
571 case LDPT_REGISTER_CLEANUP_HOOK
:
572 TVU(register_cleanup
) = register_cleanup
;
574 case LDPT_ADD_SYMBOLS
:
575 TVU(add_symbols
) = add_symbols
;
577 case LDPT_GET_INPUT_FILE
:
578 TVU(get_input_file
) = get_input_file
;
580 case LDPT_RELEASE_INPUT_FILE
:
581 TVU(release_input_file
) = release_input_file
;
583 case LDPT_GET_SYMBOLS
:
584 TVU(get_symbols
) = get_symbols
;
586 case LDPT_ADD_INPUT_FILE
:
587 TVU(add_input_file
) = add_input_file
;
589 case LDPT_ADD_INPUT_LIBRARY
:
590 TVU(add_input_library
) = add_input_library
;
592 case LDPT_SET_EXTRA_LIBRARY_PATH
:
593 TVU(set_extra_library_path
) = set_extra_library_path
;
596 /* Added a new entry to the array without adding
597 a new case to set up its value is a bug. */
602 return tv_header_size
;
605 /* Append the per-plugin args list and trailing LDPT_NULL to tv. */
607 set_tv_plugin_args (plugin_t
*plugin
, struct ld_plugin_tv
*tv
)
609 plugin_arg_t
*arg
= plugin
->args
;
612 tv
->tv_tag
= LDPT_OPTION
;
613 tv
->tv_u
.tv_string
= arg
->arg
;
617 tv
->tv_tag
= LDPT_NULL
;
621 /* Return true if any plugins are active this run. Only valid
622 after options have been processed. */
624 plugin_active_plugins_p (void)
626 return plugins_list
!= NULL
;
629 /* Load up and initialise all plugins after argument parsing. */
631 plugin_load_plugins (void)
633 struct ld_plugin_tv
*my_tv
;
634 unsigned int max_args
= 0;
635 plugin_t
*curplug
= plugins_list
;
637 /* If there are no plugins, we need do nothing this run. */
641 /* First pass over plugins to find max # args needed so that we
642 can size and allocate the tv array. */
645 if (curplug
->n_args
> max_args
)
646 max_args
= curplug
->n_args
;
647 curplug
= curplug
->next
;
650 /* Allocate tv array and initialise constant part. */
651 my_tv
= xmalloc ((max_args
+ 1 + tv_header_size
) * sizeof *my_tv
);
652 set_tv_header (my_tv
);
654 /* Pass over plugins again, activating them. */
655 curplug
= plugins_list
;
658 enum ld_plugin_status rv
;
659 ld_plugin_onload onloadfn
= dlsym (curplug
->dlhandle
, "onload");
661 onloadfn
= dlsym (curplug
->dlhandle
, "_onload");
663 return set_plugin_error (curplug
->name
);
664 set_tv_plugin_args (curplug
, &my_tv
[tv_header_size
]);
665 called_plugin
= curplug
;
666 rv
= (*onloadfn
) (my_tv
);
667 called_plugin
= NULL
;
669 return set_plugin_error (curplug
->name
);
670 curplug
= curplug
->next
;
673 /* Since plugin(s) inited ok, assume they're going to want symbol
674 resolutions, which needs us to track which symbols are referenced
675 by non-IR files using the linker's notice callback. */
676 link_info
.notice_all
= TRUE
;
681 /* Call 'claim file' hook for all plugins. */
683 plugin_call_claim_file (const struct ld_plugin_input_file
*file
, int *claimed
)
685 plugin_t
*curplug
= plugins_list
;
687 if (no_more_claiming
)
689 while (curplug
&& !*claimed
)
691 if (curplug
->claim_file_handler
)
693 enum ld_plugin_status rv
;
694 called_plugin
= curplug
;
695 rv
= (*curplug
->claim_file_handler
) (file
, claimed
);
696 called_plugin
= NULL
;
698 set_plugin_error (curplug
->name
);
700 curplug
= curplug
->next
;
702 return plugin_error_p () ? -1 : 0;
705 /* Call 'all symbols read' hook for all plugins. */
707 plugin_call_all_symbols_read (void)
709 plugin_t
*curplug
= plugins_list
;
711 /* Disable any further file-claiming. */
712 no_more_claiming
= TRUE
;
714 /* If --allow-multiple-definition is in effect, we need to disable it,
715 as the plugin infrastructure relies on the multiple_definition
716 callback to swap out the dummy IR-only BFDs for new real ones
717 when it starts opening the files added during this callback. */
718 plugin_cached_allow_multiple_defs
= link_info
.allow_multiple_definition
;
719 link_info
.allow_multiple_definition
= FALSE
;
723 if (curplug
->all_symbols_read_handler
)
725 enum ld_plugin_status rv
;
726 called_plugin
= curplug
;
727 rv
= (*curplug
->all_symbols_read_handler
) ();
728 called_plugin
= NULL
;
730 set_plugin_error (curplug
->name
);
732 curplug
= curplug
->next
;
734 return plugin_error_p () ? -1 : 0;
737 /* Call 'cleanup' hook for all plugins. */
739 plugin_call_cleanup (void)
741 plugin_t
*curplug
= plugins_list
;
744 if (curplug
->cleanup_handler
&& !curplug
->cleanup_done
)
746 enum ld_plugin_status rv
;
747 curplug
->cleanup_done
= TRUE
;
748 called_plugin
= curplug
;
749 rv
= (*curplug
->cleanup_handler
) ();
750 called_plugin
= NULL
;
752 set_plugin_error (curplug
->name
);
753 dlclose (curplug
->dlhandle
);
755 curplug
= curplug
->next
;
757 return plugin_error_p () ? -1 : 0;
760 /* Lazily init the non_ironly hash table. */
762 init_non_ironly_hash (void)
764 if (non_ironly_hash
== NULL
)
767 (struct bfd_hash_table
*) xmalloc (sizeof (struct bfd_hash_table
));
768 if (!bfd_hash_table_init_n (non_ironly_hash
,
770 sizeof (struct bfd_hash_entry
),
772 einfo (_("%P%F: bfd_hash_table_init failed: %E\n"));
776 /* To determine which symbols should be resolved LDPR_PREVAILING_DEF
777 and which LDPR_PREVAILING_DEF_IRONLY, we notice all the symbols as
778 the linker adds them to the linker hash table. If we see a symbol
779 being referenced from a non-IR file, we add it to the non_ironly hash
780 table. If we can't find it there at get_symbols time, we know that
781 it was referenced only by IR files. We have to notice_all symbols,
782 because we won't necessarily know until later which ones will be
783 contributed by IR files. */
785 plugin_notice (struct bfd_link_info
*info ATTRIBUTE_UNUSED
,
786 const char *name
, bfd
*abfd
,
787 asection
*section
, bfd_vma value ATTRIBUTE_UNUSED
)
789 bfd_boolean is_ref
= bfd_is_und_section (section
);
790 bfd_boolean is_dummy
= is_ir_dummy_bfd (abfd
);
791 init_non_ironly_hash ();
792 /* We only care about refs, not defs, indicated by section pointing
793 to the undefined section (according to the bfd linker notice callback
794 interface definition). */
795 if (is_ref
&& !is_dummy
)
797 /* This is a ref from a non-IR file, so note the ref'd symbol
798 in the non-IR-only hash. */
799 if (!bfd_hash_lookup (non_ironly_hash
, name
, TRUE
, TRUE
))
800 einfo (_("%P%X: %s: hash table failure adding symbol %s"),
801 abfd
->filename
, name
);
803 else if (!is_ref
&& is_dummy
)
805 /* No further processing since this is a def from an IR dummy BFD. */
809 /* Continue with cref/nocrossref/trace-sym processing. */
813 /* When we add new object files to the link at all symbols read time,
814 these contain the real code and symbols generated from the IR files,
815 and so duplicate all the definitions already supplied by the dummy
816 IR-only BFDs that we created at claim files time. We use the linker's
817 multiple-definitions callback hook to fix up the clash, discarding
818 the symbol from the IR-only BFD in favour of the symbol from the
819 real BFD. We return true if this was not-really-a-clash because
820 we've fixed it up, or anyway if --allow-multiple-definition was in
821 effect (before we disabled it to ensure we got called back). */
823 plugin_multiple_definition (struct bfd_link_info
*info
, const char *name
,
824 bfd
*obfd
, asection
*osec ATTRIBUTE_UNUSED
,
825 bfd_vma oval ATTRIBUTE_UNUSED
,
826 bfd
*nbfd
, asection
*nsec
, bfd_vma nval
)
828 if (is_ir_dummy_bfd (obfd
))
830 struct bfd_link_hash_entry
*blhe
= bfd_link_hash_lookup (info
->hash
,
831 name
, FALSE
, FALSE
, FALSE
);
833 einfo (_("%P%X: %s: can't find IR symbol '%s'"), nbfd
->filename
,
835 else if (blhe
->type
!= bfd_link_hash_defined
)
836 einfo (_("%P%x: %s: bad IR symbol type %d"), name
, blhe
->type
);
837 /* Replace it with new details. */
838 blhe
->u
.def
.section
= nsec
;
839 blhe
->u
.def
.value
= nval
;
842 return plugin_cached_allow_multiple_defs
;